The Snapshot Wisconsin project is a citizen-based science initiative that uses trail cameras to document what’s going on in the woodlands and other wild places when no one is looking. The project relies heavily on volunteers. The citizen scientists go through a training class, place a trail cam at an approved location, collect the images at least once every three months, upload the images to a website and classify the images. After the Wisconsin Department of Natural Resources receives the images from the trail cams, it places them on a site where the public at large can participate in viewing and classifying.

Click through the gallery above to see trail cam photos of wildlife spending the winter in Wisconsin, from white-tailed deer and red squirrels to otters and bobcats.

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Wisconsin, the 30th state of the Union, might be most famous for its cheese and the Green Bay Packers, but there's more to this Midwestern state than its cheesy heritage. Located on the western shore of Lake Michigan, Wisconsin has surprising natural beauty. Pictured here are the Apostle Islands. Wisconsin Department of Tourism

Wisconsin might produce 2.5 billion pounds of cheese each year, but it's also the nation's largest producer of cranberries. During the autumn cranberry harvest, visitors can drive along the 50-mile Cranberry Highway to see the cranberry marshes in the central portion of the state. Wisconsin Department of Tourism

Horicon Marsh State Wildlife Area attracts birdwatchers, paddlers and hikers. As one of the largest freshwater cattail marshes in the country, Horicon attracts thousands of migrating ducks and geese each year. Flickr/chumlee10

Bike-friendly, walkable, eco-friendly and football friendly, Madison is many (good) things. The central park of the state capital sits on an isthmus between Lake Mendota and Lake Monona. Wisconsin Department of Tourism

Pay a visit to Washington Island and you might think you've ended up in Scandinavia. The town is home to a Stavkirke church modeled after a 12th-century church from Borgund, Norway. Flickr/Leif and Evonne

The first thing that comes to mind when you think Wisconsin probably isn't a beach, but that's just what you'll find at Atwater Park in the town of Shorewood. When it's too cold to swim in Lake Michigan, you can still admire the sculpture by Jaume Plensa, the same man responsible for the iconic Crown Fountain in Chicago. Visit Milwaukee

With more than 60 golf resorts and 500 courses, Wisconsin deserves a spot on any golfer's travel map. Pictured here is Erin Hills Golf Course, a links-style course that challenges players of all abilities. Visit Milwaukee

A beautiful harbor and art deco lighthouse make Port Washington one of Wisconsin's most charming small towns. The downtown area on the banks of Lake Michigan has the state's largest concentration of pre-Civil War buildings. Visit Milwaukee

Arguably the most iconic photo op in Wisconsin, Milwaukee's Bronze Fonz stands along the downtown Riverwalk, commemorating the character from the hit sitcom "Happy Days" which was set in Wisconsin in the 1950s. Visit Milwaukee

At the Harley-Davidson Museum in Milwaukee, visitors take a journey through American history from the perspective of one of the USA's most iconic companies. Even non-motorcycle enthusiasts will enjoy its unique interactive exhibits. Wisconsin Department of Tourism

It's hard to miss the Milwaukee Art Museum, thanks to the 2001 addition known as the Quadracci Pavilion, a postmodern architectural work of art designed by Spanish architect Santiago Calatrava. Flickr/O Palsson

Considered one of the best ballparks in the Major Leagues, Miller Park is home of the Milwaukee Brewers. A retractable roof means fans can enjoy America's pastime no matter the weather. Visit Milwaukee